Water-tight joint for concrete water-pipes.



WATER TIGHT IOINT FR IICRETE W'IER PIPES.

APPLICATION FILED JAN. 26, |914.

Patenw Jun@ 15, i915.

@MMVI/m LA oww/Wy @fm-Nrw@ www@ www ALLAN M. HIBSH-AND COLEMAN MERNETHER, 0F MNTG-Llllt, El? KUHN C. MITCHELL, 0l? EAST ORNGE, NEV JERSEY, ASSGllBS TO LUCK JON'' PIPE COMPANY, 0F NEW? 'YRIL N. Y., CRORTON DIF NEW JERSEY,

WATER-TIGHT JNT EUR CONCRETE "WATER-P PES.

rlpplication lefl January 26, i914. Serial No. Slfl. i

T0 all y11:72 oml 'it may concern Be itsknown that We, ALLAN M. llmsn' and ,COLEMAN lilsniwernnn, residingr at 'Montcleiiy and Jol-rn C. MITCHELL, residil'igr t East Orange, all in the county of Essex and State of New Jersey, have invented certain new end useful improvements in Water-Tight Joints for Concrete 'Water- Pipes,. of which the following is e full, clear, and exact description, reference being had to the accompanying drawings, forming o port of the some.

We have heretofore manufactured concrete pipes of the form showny end described in the potent to Coleman Meriwether, No. 894,517, dated July 28, 1903; ln this pipe there are employed. ,sections of concrete formed with a bell at one end and e spigot et the other, the bell being slightly longer' which projects beyond the ends of the said sections so es to overlap vWithin the groove, and tlie pipe, after the sections ere united, is completed. by e filling of cement, cement mortar, or concrete, applied by suitable means in the grooves.

For all general vpurposes, such nssewer pipes, drains, or the like, joints formed in the manner above described are fully odeqnate to meet allA of-fthc conditions encountered in practical use, end experience has demonstroted that such joints ere folly cof pable of withstanding, Without leakage en internal pressure of live' or six pounds to the square inch, 'y l `Wc hsve'iound, however, the't when lthe pipes are designed to withstand e substantially higher pressure, such as is ordinarily encountered in 'pressure moins or Water pipes, that the ordinary jointis not sullen.`

cient, for shrinkage cracks 'develop at the joints, which, While perhaps not visible4 to the naked eye, will nevertheless permit the leakage of e large quantity of Weterl Alter many attempts to solve this problem, end to produce e subnentie-lly *Wetentght 'j oint 'for .takes hold ol the @nieces 'of Specicaton of Letters Eatent..

durable. The principle of the construction is capable of Wide application, bot for convenience, the invention will be `described es applied to the special forro of pipe disclosed in the Meriwether patent above reierredto.

According to the present invention, there is formed, usually by the conguration of themolds, a slight depression in the body of the concrete on oooh side of the annuler groove' between the ends of the spigot and the base of the bell, and 'this depression,- after the moin portion of the groove hes been filled with ordinary cement, cement mortar, or concrete, ond allowed to set, is filled with e very line neat collent, or by an equivalent `cenientitious materiel, by ineens of a trowel or similar implement. lt is not necessary for the perfection oi the joint thetthis secondo-ry seal of cementsliould be applied in e recess or groove, but,

by 'the provision of .such e groove the inf terior surface oi the pipe is made smooth and uniform, and for this reason the recess has peculiar adrontajes'; lt has been' found that this'secondory 'lling ot cement constitutes, in its/eli, e true secondary seal, end that when used in reddition to the filler, it renders the joint, for ell practical purposes, substantially watertight, even underlhigh pressures.

The primary filling* :For the main groove may be composed of the ordinnry cement, cement mortar, or finely divided concrete,

but the secondary, or snperposed -z'illing,v

should he extremely Such lilling may be most conveniently produced by passing the ordinary commercial cement through e sieve, the meshes of which .will permit the passage of no particles larger then the one tiro hundredths of on inch, eny other materiel possessing like properties moy be used. lWhen the joint is thus produced it will be. found that the adhesion theV commercial'cement filler to the pipe sections is much less perfect thon is th t of thefsecondery seal, endthet the le. er serres es e loting with properties eine to elesticii-y and 'the .pipe seo tiene with rni end tenacious tnel?. o `joint is substW ,.;il

lili,-

.tudinal section vof a pipe,'Fig. 2, is an'en- 'line and app y the secondary seal.

tremely durablean'l eliicient, and costsxbut a trifle more thanv the ordinary joint made with a-single filler. f

.ln therfacpempanying drawingg` illustrating the invention, vFigure 1 is a longilarged 'section of'the, joint, ,andLFigHfia-`` similar section of ay modified form'of joint.

In the particular pipe illustrated, the secs VlLtionsA are molded "lnwany desired orm,.

with a bell B at one end and a spigot C4 at the other, the bell in this case being somewhat longer thanthe spigot, so that an an nular groove will be formed by the assemblage ofthe two sections, around the interior of thelpipe. .After two such sections have been brought intoabutting Contact, and this groove filled with :tbody D of ordinary cement, or cement mortar, the latter is allowed to set and a bodyof veryfinely sifted cementlE' is then applied over the primary filler.. 'This may be jdone in a comparatively few-minutsmr after the lapse of along time, "'provided 'it `fresia;-distinctly separate operation.. .ln pratice, itis Vusual to finish a given section of piptyand then, if the meter' of thel ipe permits it, to go over t 'As pointed out above, to facilitate the applicatlon of the latter and-to-prov'ide for a smooth 'interior iinish'a shallow recess or groove is formed by" providing in the ends ofthe ipe; sections notches or recesses on each si eof the main groove, as is shownin the drawings. Y Y

The form and dimensions of' the .main groove are largely immaterial, and in the annexed drawing two forms of such groove are illustrated, that of Fig. 3 being much vnarrower than in the other figures.'

In mostcases, the reinforcements of metal, when such usedat all, overlap each other, l'in the groove, and are united bythe pri# mary "illing'ofcement, or cement mortar, but this is a matter which is determined by the character of work required and thereinforcements need not overlap the joint unless it be so desired. Joints made in this way are very durable and eilicient,v The secondary seal is extremely vadherent both to the primary or main `filler, when applied directly thereto, and tothe 'parts of the cpncrete sections with which it comes into contact, and while b the main filler alone it is extremely diiiiculst to obtain a joint which will not leak under high internal pressures,

i by thea plication of the secondary seal a.

one hun red per cent. tight joint for any, ordinary pressure. is readily secured, Without limitation as to any special form `of pipe and joint, what we claim is: f

1. A water tight joint for concrete water pipes and the like, formed by they combination of twoV abutting concrete sections' hav. ing an interior groove or recess at theline ot union, a primary filler of cement, or ce,

ment mortar, for the groove, and va secondary seal of fine cementitious material.y 2. A water tight jointfor ,concrete water pipes and the like, formed -by thecombination of two abutting concrete sections havlng an lnterior groove or recess at the line of unlon, a primary filler of cement, or cement mortar for the groovean'da secondary 1 `\groove, and a secondary filler of finely divided neatcement for theA other. 4. A water 'tight joint for concrete water pipes `andthe like, formed by ythe combina-- tion of; two abutting pipe sections having a bell and spigot union, the bell being longer' than the spigot to for-m an interiorannular groove at theline of union, a filler of cement, or cement' mortar for such groove, and a secondarv seal of iinely sifted neat cement applied over the same.

5. A water tight joint for concrete water .y

pipes and the like, formed by the combination of two abutting pipe sections having a bell and spigot union, the bell being longer than the spigot to form-an interior annular groove at the line of union, and the ends of the pipe sections being shapedto form a recessover the groove, a primary ller of ces Ament, or cement mortar for the main grooveQ and a secondary seal or filler of inely sifted neat cement for. the recess over vthesame.

In witness whereof we aix our slgnatures v105l 

